Hmmm… interesting. I’ve never seen anyone mention removing that plate, so I’m not sure if it’s removable or what’s underneath it. Looking at exploded parts diagrams of this motor, I don’t see it shown as a separate part.

 

Yup its removable. Apparently there is no gasket but sealed with Toyota’s FIPG RTV sealant. Seems to be prone to leaking eventually

someone is selling a used one on ebay:

1994-2006 TOYOTA CAMRY ENGINE COOLANT INLET FLANGE 6 CYLINDER OEM 136398 | eBay

Find many great new & used options and get the best deals for 1994-2006 TOYOTA CAMRY ENGINE COOLANT INLET FLANGE 6 CYLINDER OEM 136398 at the best online prices at eBay! Free shipping for many products!

www.ebay.com

Also here is some info from a different car (same engine):

Toyota/Lexus 3.3L V6 Water Inlet (Valley) Plate Coolant Leak

Tip: if you own a Toyota 3.0 (1MZ-FE) or 3.3 (3MZ-FE) V6 and you see a buildup of pink crust around the thermostat, your water inlet plate is leaking. If it is leaking badly, coolant will drip down the transmission. This issue seems to be common on older 3.0/3.3’s after 120k. For some reason I...

bobistheoilguy.com

Just need to locate torque specs now……

 

I was curious about it as well. I was planning on doing 200,000 mile service 2001 6-cyl and was putting off the coolant bypass hose due to the amount and complexity of the work. Then I get a P0330 Knock Sensor error so along with being complicated, it's getting very expensive. FML

Fortunately I think it's the wiring harness because the error doesn't effect the driving.But I'd be stupid not to replace the Knock Sensors while everything is apart. Now it looks like I should also remove and reseal the Water Inlet Housing as well.

In preparation for the job I watched some You Tube videos and none of them mentioned this Water Inlet Housing, removing it, and/or re-sealing it.

I'll see if I can find out more info on this mysterious part.

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Yup its a big job and you would be stupid to not reseal that thing after all the work to get to it and its only FIPG sealant. The sealant is really good but eventually it wears out. Cant believe none of the videos I watched about the knock sensors, nobody mentioned that plate. Looking at your photos it looks like the torque spec is 69in-lbs with a specific sequence. Appreciate you finding those! That helps!

 

Heres a video on this page for reference on how to reseal it

More Information for AISIN AB1207B1

 

If you plan on using FIPG then you might as well get the Toyota brand.
Part number is 00295-00103 available here and other places as well.

Pardon Our Interruption...

FWIW I'm pretty sure that Permatex Ultra Black is equivalent, but I have no concrete facts to prove it one way or the other. It costs about half what Toyota FIPG costs as an added bonus.

Amazon.com

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Just did this with my Lexus, no gasket just RTV.

I torqued to the same specs ajkalian posted.

 

Sweet I’ll give it a go in the next day or so. I’ll use toyota’s FIPG

 

Note that FIPG had some leak issues when the Super Long Life Coolant (pink) was introduced (and as a result, Toyota went to o-ring type gaskets for the cooling system, in place of FIPG, after that).

When a Toyota tech told me about that I noted to use the original (red) Long Life Coolant in engines using FIPG in the cooling system joints.

 

I found a couple of good videos changing the knock sensors. This one goes through the entire process step by step but doesn't change the Water Inlet Housing. Nor does he give all the part numbers necessary for the entire project.

This guy watched the video above and then ordered all the necessary parts. He goes through them one by one, and lists them all at the end. It's a good reference, but he doesn't use OEM Knock Sensors, and there's a minor difference in the Wiring Harness Clip. I show 90467-28008 but he shows 82711-06120. It might be the difference between the Camry clip and the Lexus clip. Dunno. This guy replaced all the injector and fuel rail gaskets. I'm not sure this was necessary, and I think that the entire fuel rail could be moved intact out of the way. But I might be mistaken.

If you are going to tackle this project, both are worth watching.

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Got the coolant bypass inlet plate out. Just got to clean it up and get it ready for a fresh FIPG seal. Wasnt that bad to remove

 

Interesting, and good to know. I’ve got a bypass hose and knock sensor harness sitting on my workbench, waiting to get installed in my 418k mile Avalon. If you hadn’t posted this thread, I wouldn’t know to reseal this plate, so thanks!